Texas Code of Criminal Procedure - CRIM P Art. 17.19. Surety may obtain a warrant

(a) Any surety, desiring to surrender his principal and after notifying the principal's attorney, if the principal is represented by an attorney, in a manner provided by Rule 21a, Texas Rules of Civil Procedure, of the surety's intention to surrender the principal, may file an affidavit of such intention before the court or magistrate before which the prosecution is pending. The affidavit must state:

(b) In a prosecution pending before a court, if the court finds that there is cause for the surety to surrender the surety's principal, the court shall issue a capias for the principal. In a prosecution pending before a magistrate, if the magistrate finds that there is cause for the surety to surrender the surety's principal, the magistrate shall issue a warrant of arrest for the principal. It is an affirmative defense to any liability on the bond that:

(c) If the court or magistrate before whom the prosecution is pending is not available, the surety may deliver the affidavit to any other magistrate in the county and that magistrate, on a finding of cause for the surety to surrender the surety's principal, shall issue a warrant of arrest for the principal.

(d) An arrest warrant or capias issued under this article shall be issued to the sheriff of the county in which the case is pending, and a copy of the warrant or capias shall be issued to the surety or his agent.

(e) An arrest warrant or capias issued under this article may be executed by a peace officer, a security officer, or a private investigator licensed in this state.